Okay. Here is the culmination of a little more than a year's worth of effort. It's what I mentioned elsewhere under a Hebrew name.
The final screen count is 4744, making up 310 levels in this... level.
It took me about 2 and a half hours to finish playing it, it took a couple friends some indeterminate amount of days. My sister is clocked at over 10 hours right now.

This is primarily a puzzle game. If you've played the trash can BLOCKS game in Too Much Soda, it's kind of like that but way better in every way. If you haven't, play this anyway.
There is a story that goes along with it, very illegible, but a friend likes to call them "cutescenes" and I decided that's indeed what they are.
Anyway.

 
http://www.mediafire.com/download/5y3d1b7t246d331/KG_-_Define.knytt.bin

Unfortunately, it seems that having such a large amount of things in it gives it a loading time. So don't freak out if Knytt Stories doesn't immediately respond when you start it, it's just loading. Yeah if anyone was wondering what happens when you have a big level, apparently that.

Oh, and there are four endings. One "bad end", one "good end", and two literal side-by-side other endings. If you get all of those, you probably found everything there is in the game, which is generally straightforward. Uh, in a sense anyway.

Edit: Oh 2, an important thing I forgot. Don't try to play this all in one sitting. Not only is it a long game, it also acts weird if you play it for too long. Specifically, the custom objects freak out and stop working.
If that does happen, or if you suddenly drop down in infinite nothingness (which I think is a byproduct of the aforementioned issue somehow?), turn off the game and then turn it on again. Yeah like what the guy says in the IT Crowd.

Edit 2:

I decided to make some very minor adjustments, and now here is a version that is slightly less difficult in like... six or seven spots, but more notably it's easier to see which blocks are deadly because their letters are tinted red.

https://www.mediafire.com/file/egd0wlsc8bzhdjo/KG_-_Define_-_Easy_R.knytt.bin/file

I stopped making this like a year ago and I don't know if I'll ever finish it. Sorry, Nifflas. Your editor is just so annoying. (Though to be fair, it doesn't help that I got into RPG Maker among other things.)
So I'm putting this here.
It has custom stuff and two bosses. Technically, in the state it is currently in, it is about a third finished.
It's pretty awesome though. No really.

http://www.mediafire.com/?gitqcim0daz

Also nobody ever credits the artist, but I say you should, every now and then, spend a minute watching the custom objects I made.

A long time ago, I started making the sequel to Too Much Soda. I never finished it.

Reasoning that I probably never will, either, I will put it here in unfinished form as the second-smallest Knytt Story I ever made. For the purposes of this forum, this is a finished level that happens to include the word "beta" in its name. This is that level I used to often refer to as "pretentious crap".
It has fortunes in it.
It is potentially not intended for children.

This is a link.

Yes.
Basically, take a screen (see screenshot number 1) and hide a layer by right clicking on its appropriate number.
Then go to an empty screen and unhide the previously hidden layer (see screenshot number 2).
For some reason, this will cause the screen you were originally at to appear on that screen. However, as you can see on the minimap, the screen does not actually exist. If you try placing an object, it seems that every other object on the screen disappears (but not the tileset). The tileset tiles in this fake screen can be removed with any tileset layer.
I'm assuming this is not a huge, program-threatening error, but I suppose you'd rather it didn't do that, eh?